Kidding? With 43 million online users for its mail service alone, 250+ employees rediff is too big a company to worry about SEO as done by small sites. 156th most popular site on the net do not need any special efforts to get noticed by google. Even if they wanted to do a sitemap, what is the big deal? They must have a technical team of 100+ people and this should be easy job! Obviously it would require them to brak up the millions of URLS generated by a variety of methods(directly from database, not by crawling!) into separate files and use the master file as specified by google. Now what exactly you want to know?